| Earned Runs Allowed in Season | ||||||||
| No Changes in 2005 | ||||||||
| Rank | Year | Gms | BF | IP | R | ER | ||
| 1 | 1984 | 44 | 1491 | 322.34 | 497 | 351 | ||
| 2 | 1988 | 48 | 1914 | 404.33 | 395 | 299 | ||
| 3 | 1985 | 48 | 1945 | 390.34 | 388 | 290 | ||
| 4 | 2002 | 47 | 1660 | 387.67 | 377 | 277 | ||
| 5 | 2000 | 52 | 1977 | 429.00 | 310 | 261 | ||
| 6 | 2001 | 59 | 2196 | 497.33 | 299 | 255 | ||
| 7 | 1990 | 43 | 1717 | 364.33 | 299 | 240 | ||
| 8 | 1987 | 41 | 1616 | 341.66 | 285 | 234 | ||
| - | 1986 | 44 | 1674 | 356.33 | 291 | 234 | ||
| 10 | 1992 | 42 | 1669 | 348.00 | 279 | 222 | ||
| 11 | 1998 | 50 | 1871 | 419.33 | 275 | 218 | ||
| 12 | 1977 | 37 | 1243 | 269.34 | 295 | 199 | ||
| 13 | 1997 | 43 | 1705 | 356.00 | 254 | 198 | ||
| 14 | 1993 | 40 | 1634 | 342.30 | 275 | 197 | ||
| 15 | 2003 | 58 | 1864 | 491.67 | 268 | 193 | ||